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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'd98ebae627f5980a2ac6cd54ce93bc417b65836204a58adc8a832e814e81d6cd' 
  AND token = '2Aj1v5vdlMd60IUpxcn6gdn1SMqFEFaLcpSMN3HQHHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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