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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '21d9e7bd0ed274893b87031b2a02a1b0b32611cef6a64433a633ebe9a8c2efef' 
  AND token = 'JKbaRj33+mRqmr1kCmCq07UMkT8/2bXckcpBCjJZdL4=' 
  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"
    }
  }
}