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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b093a1e704908929d88e7a9fd364b9f8dba925d2087f64a99d7598551e3f1f15' 
  AND token = 'EybW/AkJo2TMaHWkKQrC0uLD+6HNEur+C7Ik/UYqCOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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