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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec698111f830fe59c3afb2e050b0a24fd4fd847a0dace71b9210a14175f0060b' 
  AND token = 'LQVhc/Trl7BDmZkhaC35K++H4PcfAg/bwQIswOtrX+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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