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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d26c4e48f90bf15c0e7ca42fc18aca536e557c8339d10b4475ec5bbbe7a9366' 
  AND token = 'THkerfIYtMOLRhMaGf8g8PWQE54NcU/L3u+IBw6Lhpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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