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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '8c2211c479de4df74e1d62196dfd0c1d6dfcddeaf17aca09cfd449d1dd8dec0c' 
  AND token = 'fA/1wcj3+1yI2vPTIeT5paQlPAiOAR1XrOyqmsHT6Ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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