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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c3700e8bef6e4a05f3e3de2dc5d134c5b74e9de57a1b739d28e8db07f7528f5' 
  AND token = 'OMx1Me56wbIaN0941t1pLmsSZX9VhipY8HbxMmV5fZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00092

JSON explain

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