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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '258e5b3429239e387c547f39b2aebe15166d726b4dae780d1f952dafbd46f35d' 
  AND token = 'h0/I2HJqa+07fmgC796QAUXAbK40+Id0Iku1RnVlTFY=' 
  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"
    }
  }
}