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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2adc69b0990e6714c3b251b2c820a11d4072f8242351f2eb34f0f3b6762c7a61' 
  AND token = 'mdWCRjEnl5YUls9ECr+MZagD1gn6uvqbyCPK177XX4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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