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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd084e0a902d4af6ae894cfdd1d373532102b39a3e1bef56bd17dd718afa8045e' 
  AND token = 'eOiFx/TR5st9fScKN9AwroeF4aXzxz0/C5O2mi4GTVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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