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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bdfce8fff99a04cbb3e1d2fb20a2611b1dbc652bf1b4dc30167444d269f9b73' 
  AND token = 'k0MRLe3t0wxqVxdIdgX4NtTKB2d6w1Ob5Edk6HUtFSo=' 
  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"
    }
  }
}