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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cb0f7fb573b0c4dbd3013f72ba103be7deaee796e2250b3f10e3d11c9913997' 
  AND token = 'muIIqcrOAEGKYXVQH4/8Jo0hRuq5V2L19s+5GsFp5Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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