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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a31d66c05d44ef82b607277c536d6e975bd5dac3c0e7b4ccb6ed053341854d59' 
  AND token = 'LQl36OcdBfylSm3sx5Ds51lZhBz/WiykglJwiu+34/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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