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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8663934ef0cf0c12c624fe5323a9c9ef8b41c12c018a86ce09a789248a536628' 
  AND token = 'wF2FjZn4Rfb/V2wXt3fuOAPCrCrtdUD15TD5/ekv11Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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