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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd14a745d0f8bc54c81c2563b6844c03bd55324a18324d6cd6ff88353777f27f1' 
  AND token = 'kdc2He2NfkAiGH58RjjwLwstIrf8xPGP8mZ+GAOUM+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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