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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a682d52dad373402d890f5fe8a3029572d87dc80b8991a4d79fdfc79f230159' 
  AND token = '1yvdeEPzaa2ZqVf0Au6n+2Ox4QSAxkcxdkckm2ewqUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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