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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a7c72d8a4d2d0bb65cee0cf898eb20ecfa9920b9fe60e7d1adc49f9564bb7dd' 
  AND token = '736dKyMBWnUXr77RN6xvJvjZvOyGYsFabQi30+UYjfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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