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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1923e9d5a1e5464552c1472605d40da1bef43673a7f81d3ed0716cdf2c8b3809' 
  AND token = '2l8c3hzSwcltiMehGE+xM7ggm9H/kiUc7IReNDXBCvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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