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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10d0dbf8ec7761911fd7e0cc5997511dca83bdf6545915ace6e73509e646585c' 
  AND token = 'Xz/pQbaHLfYJrW3322jY3NF2yms03uwbecTg/qWlzgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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