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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '7e8481154f01aa358c901e25717928b964dafeacdef06cc53dac03572f5c228c' 
  AND token = 'yBp+SxmM6BJnjckaNHMjaT4kKTIOApoYttkhqhBpwho=' 
  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"
    }
  }
}