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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13956e9a09dd1ddc9bd6e0a341117c828119f7a83a5d177b79ccfc4eb7b15d9c' 
  AND token = 'huLLhYoZL/sSnGUs561vLsU+okCu9gqsbiyHTeX2VAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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