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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a713413fc6a8018d76279fef49e8b9092380418de0b1ef1389dc9a4b75da59d6' 
  AND token = '/gFo8DDR4ve7VYrd7UaOJ/UJ0qhnTJMSiEBDPme95Uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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