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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a478feebae575c0d5640a808ba001f5c432a30ce4b553ea2d1437bdc4d37ef9' 
  AND token = 'ThVsmpLge8cGgvAdEcLWdyI0omM0n/HkcNkI6UQ9ewc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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