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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b18be3ee5c0864c224e2e6f61b6a86fd2f95c6c41f56cdd18e0fbfdffc9cc5fe' 
  AND token = 'VngwquY/5j/eCESVz3ZfPD+XEtbN+39sYdSYvz9Hcg0=' 
  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"
    }
  }
}