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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e820e75ef27a86ea650905861ebd41d7eb8e11479247192139210cce84adbab' 
  AND token = '3U3Duq+A/eSqcQB1pmp2585s/h+ow2WaajkU1Hu9WPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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