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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a2ad4182096d52cadf153f043c7a308533097a63001de14cca5493aab4b1469' 
  AND token = 'clWiTTTlWgIOj8gHFXvheeM1xUrhhZ9keUDVfbp0aX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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