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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6bc6aa2a94fde2a636cfe634568d0d3028cb07e40aa720137dbc78aaabe7251' 
  AND token = '+EWV9F+39SsM3YDB77jDnw/4yXrKVV6laUmn2Fq+BBY=' 
  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"
    }
  }
}