SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'f5f21c8978dd3d9b1f7e5169dd59ff1f39d7ee98cc2ca0eb4af272bc0eca3aa5' 
  AND token = 'G4q5Tf0apYwwgOlj/VhJJK+d4HwMOS4o9c96TZtdk5Q=' 
  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"
    }
  }
}