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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bd3b0cb92485b60000dd9f578d6a52ddc322da9c51a5ab785b796313283313b' 
  AND token = '8FDNRiYFzvuo7dnHYuF0J66LMATu+7iy02uOx84e0mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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