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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b864196d43ab3cf3a940d9d3b53ac8858e3d50a038f676d565952c7995fd5f7' 
  AND token = 'yAhSnGADqdYR++rAKiOBpAX7/LH77ZQh3Uc62hZuF50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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