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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '3f7d7cf80cd9377712449dd1a2b49f0b056c538e85d5b60b90466336b07228c5' 
  AND token = 'i1KLkBSLLGy68akQT+LhuhRbpRURd0IfeD9l7Egm3sA=' 
  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"
    }
  }
}