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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d3bc4172ff2418cb1fedf0885f12ffb1891e751dd55a840defe689ff6e8e3fa' 
  AND token = 'er/jEAeJv+dmS0IfNytJzaB3qquUpl5dDd5v+QVYQbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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