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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30fc3f2d90a7b2b69c332b9bb1be327fe2bf054d310bbc1844c8e9c36490c13b' 
  AND token = 'a5WZdPyCwJVcE+65WYvPGovyXkFwC3HlO4Yzr6TQjxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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