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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56fb57dbd277f2ce4574f4133c2888a0f0cbfae3179ea55f02409056170dd4f0' 
  AND token = '3yqzuCaf5RBwh94FePOv4ty8aXvT6tY4cmh/TTMM0mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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