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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6810eed5562161b813f27371a521fe4ee7c84f21fed601d3ccc9e50885cfcbf8' 
  AND token = 'm0COk33GYt9Wj53uqjqoNk3UYijJAU6uz7buRMxpBTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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