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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cb9c7959f0804918ddfd354fd8e0a4478b3636357446d00be3995ed2c284560' 
  AND token = '2rrSYM7XLx7DDLhSvdFdtRZ2M6Pzu+F5J6mjeTH0Rpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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