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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49ee5d09e2e92ecb870ac03e15c00d4d42658a4a31f2a2d918709998c608ea9d' 
  AND token = 'rheHkXAjgKdv/co3/pqHMZDnUak8MF3WlkHXxrHfCFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01205

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}