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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'f8f3bd76965aba92456ef03ac0b29e34e6f59ae091ef00ec2f360585bce09194' 
  AND token = 'Xr+RFRbjXDZSr6GY1+AXR+sPo3kvSvvgjIoiBbBrBPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}