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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d4c02cab028686d8bb60dcf9f6a8ca10d47796c24fb795a8027ecf4c19cff44' 
  AND token = 'NE0H5vqoX2WTFF2PHZWjAWt5qC7rRNOYBkNtCNP24R8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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