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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2578b9cf8f7353ba37fde6e659632d81608c2a02e86ee0795310d479be3e78bf' 
  AND token = 'e6eHrIOkfSrz1JGyD3G64H8H0JqP+sNzDW/kwuSN2pA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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