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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6278db1f6469233193d601a447e1bba3e24f9e4e354d877d25cad1f717cc199f' 
  AND token = 'Lb8EWav2kO77+vLAHA0CkzPMyflhX8ae7GTXpemvrwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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