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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd19f3434ad2fe333836fd4416a5deed73ae1f7adf163875d5ace0e3e37b9c94' 
  AND token = 'f+Lf5308CTuOyKCmvNeqt9o+nW6MSLuaRUvvVeB0PXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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