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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '1a9b036bdab61110b010d6358752558c8ff13ac44f205f8d966956315fcddf12' 
  AND token = 'mmVy7WiMsB+2dVB6aThPW+/M1K2msHMOTH+wzrm8duU=' 
  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"
    }
  }
}