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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff6c508e1221c3e804932c41993dae827703ffc7ee5ee7251e76aaafcc0b94da' 
  AND token = 'qLl2p/3vf+Fmmlmlxf2c5uVxeMuWzTTP9KEfx7EnLco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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