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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcc33d641a4ee49a28a362d871377e127ed1a80a3c73d80b5b4c6312c5ae2999' 
  AND token = '+hzdSdXFwgHoB2N3S+4C7YCOAXDt6Ra2JyDFvGdgMQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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