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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '5c7f0b0fc3a0dd57d4ca526ee6cd6df1df89e43f0e52ecc72fd794de804bd875' 
  AND token = '0oFVvFldI8ATxPISLzc3/Ks4wGUoCLwUCNNMN0jn250=' 
  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"
    }
  }
}