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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '119859e522ae559f99ef1d4e07d0632e60f80278702412f6f0bcf4dcbe2842c2' 
  AND token = 'baZsTLN6YzYn5L3+WEESMwwav+mR9zCd1n81hp/0qrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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