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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fa0cb992aeb3d14aec73c1d2b0172ac06d4f04777d9b3af75aa0302c1b053b1' 
  AND token = 'GN2M0c87KU8qwpQNZfiZHDq0H10eYs/uieYuzzOX5VI=' 
  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"
    }
  }
}