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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'e0bd32f68b3062d0d5034436bc337d0ac72a9e6f56b0b25b3b573493e188ff42' 
  AND token = 'vIytvfDcHdXeNY1i6saH1IVC9m1qEqs12xmyalZZ+d0=' 
  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"
    }
  }
}