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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '998e0fbd56a4627c9cebd41566712ad37a8c6817992a532a63513dddf0631c5d' 
  AND token = '50TpkgUjxKQtkfeDF6aQn9UbLhzIC35vgJH/C4iIofw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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