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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de9335911c0551feb5aa83aec767b38206642c568515fcd02d405109a4663666' 
  AND token = 'MtOmVmWGssRt69wGH/9171o+5vIjQ/WOq1A3EY1W6Aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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