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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '3c09f2fd2df164c192e9325f9a1e8259002f8ca7bb1ab04dde3f46d51439be21' 
  AND token = 'c+Hv0n+7u9OaNZUoABZcdtTbulJFfX7ubqAt+m3VRCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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