SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'fb557fb8f45b28da7b2d4f337e78133200776681d63621f6c5cc056fc41cf2a6' 
  AND token = '91Nb6LF/jVCmJgtFJ+MPWBFJ4iHzgwX375AmV4Cvjbg=' 
  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"
    }
  }
}