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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd20db8e707a38ab841a04903bd9934f09b67051a30e7d675e543d1ab2ca3f4c8' 
  AND token = 'b/PyQDlYAUoUq1Jl+GRxji6cC/8J+xREaLHocnwiocE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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