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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'b17f7ae010a0e527edeecca9ef1505c1b334a04ea28a0f70572d045dd05b5692' 
  AND token = 'MVSNatyMdU7QUhtOZyMDpTMJhcpY5MOiH9+12MoK5c8=' 
  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"
    }
  }
}