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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'dd3f73024178488665353d099b060f05acc47bf79f9eec2cc6389f3cbfe537be' 
  AND token = '0AuAx4VfZ64YQ8VfNDYqEzy8QmaeehU5XAgSsSneOAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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