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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dcc4e4c37220ad37aa74310cd670f6441d7884e97acbe830d7d3fdb9c8257f5' 
  AND token = 'qU+ApmnQ+nOoiiG9rFxnUIp/jnSs3dxlYm3bp4OPvu8=' 
  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"
    }
  }
}