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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0356fa5db5d5487a6d0542db0cd0e7bb3d18d8f42c05ca91c91784e075422af1' 
  AND token = '6+inzUDVMPhJp1JimvqEXTk1LdNqfOqRcxmtaqw67Nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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