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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'e2e14f78b99d66fe60a25bff0900e08c17aa2911506d9e9383caa56f694f10ab' 
  AND token = 'fXFYe+u8g468jngYivDc3GW2fh13ncvpIYr1f6Q8kQM=' 
  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"
    }
  }
}