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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b56ce9409a6115de69a3abf8ec279e2552a9ead0c57713e2f50e6000562d945b' 
  AND token = '/z/vDYUDv2ybzkvI3KY/qs6tZ0AOWDv4BJQQCbfo5TQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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