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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4580ab142994c7e44c0ab7bcfc1aecd0379efac301984353ebdd9044f7546d38' 
  AND token = 'Wsyq1yT9ah8j18mwNdeYbEgUsBV+qxOEjngqK0McW+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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