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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a02845545ff46c7b209a871be4ef7a0db24a5682d8ace8dbe46286a78c59f75e' 
  AND token = '73LEqqT0fBLklyXtM/jbyd+ZpRJczKpi7/RyIJMfLkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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