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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0236a484bb5ead5720b11bca18efcf08a0a78247716b9a8b6dfa1aa4f888914' 
  AND token = '1A2TvOQzEUDm8FI/+dUcTALi0G29quxxph2qGX2mqz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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