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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '591a9686caada4e140b3cd891ace10e2edead3a699aedca6dd4308a5cc5a5384' 
  AND token = '9gBc5lX2wt5AVa3RQwJp2A7fAJV81cfkGXa5PDC96lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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