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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41e33abeb00fd556a77f5b2c6129502e6aebcca46c64a7c07cca1a67f8e82aec' 
  AND token = '/5wijRn21sXKjsJz8Qk8kuc9n8iw7pZcvMYD2G96qHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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