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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14f6e7a100df124eefde0a5a7c9dd17d7a8f9759d59989eba97a9516d5d5bb9b' 
  AND token = 'LgQW18OihttF/Hoew8s8gA5zkxlefNZKJ9HHIaOnNAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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