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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '018bb59b0201a7e379597ed5420fd665649214be68bd1bb3f628b344735a9396' 
  AND token = '96BZGjy5QBA8vntw18gfnmEIM1jpr0qU1B6ifGtryVU=' 
  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"
    }
  }
}